noun
Informal . a ghost; specter.
Slang . a ghostwriter.
Slang . an eccentric person.
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verb (used with object)
to haunt; inhabit or appear in or to as a ghost or specter.
Informal . to frighten; scare.
verb (used without object)
Informal . to become frightened or scared:
The fish spooked at any disturbance in the pool.